SSM整合以及相关补充(11) _生活百科

这里选择在业务层抛出异常

package com.itheima.service.impl;import com.itheima.controller.Code;import com.itheima.dao.BookDao;import com.itheima.domain.Book;import com.itheima.exception.BusinessException;import com.itheima.exception.SystemException;import com.itheima.service.BookService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import java.util.List;@Servicepublic class BookServiceImpl implements BookService { @Autowired private BookDao bookDao; public boolean save(Book book) { bookDao.save(book); return true; } public boolean update(Book book) { bookDao.update(book); return true; } public boolean delete(Integer id) { bookDao.delete(id); return true; } public Book getById(Integer id) { //模拟业务异常，包装成自定义异常 if(id == 1){ throw new BusinessException(Code.BUSINESS_ERR,"请不要使用你的技术挑战我的耐性!"); } //模拟系统异常，将可能出现的异常进行包装，转换成自定义异常 try{ int i = 1/0; }catch (Exception e){ throw new SystemException(Code.SYSTEM_TIMEOUT_ERR,"服务器访问超时，请重试!",e); } return bookDao.getById(id); } public List<Book> getAll() { return bookDao.getAll(); }}

表现层异常处理器增加

package com.itheima.controller;import com.itheima.exception.BusinessException;import com.itheima.exception.SystemException;import org.springframework.web.bind.annotation.ExceptionHandler;import org.springframework.web.bind.annotation.RestControllerAdvice;//@RestControllerAdvice用于标识当前类为REST风格对应的异常处理器@RestControllerAdvicepublic class ProjectExceptionAdvice { //@ExceptionHandler用于设置当前处理器类对应的异常类型 @ExceptionHandler(SystemException.class) public Result doSystemException(SystemException ex){ //记录日志 //发送消息给运维 //发送邮件给开发人员,ex对象发送给开发人员 return new Result(ex.getCode(),null,ex.getMessage()); } @ExceptionHandler(BusinessException.class) public Result doBusinessException(BusinessException ex){ return new Result(ex.getCode(),null,ex.getMessage()); } //除了自定义的异常处理器，保留对Exception类型的异常处理，用于处理非预期的异常 @ExceptionHandler(Exception.class) public Result doOtherException(Exception ex){ //记录日志 //发送消息给运维 //发送邮件给开发人员,ex对象发送给开发人员 return new Result(Code.SYSTEM_UNKNOW_ERR,null,"系统繁忙，请稍后再试！"); }}